US9228466B2 - Method for operating a dosing valve, and corresponding internal combustion engine - Google Patents
Method for operating a dosing valve, and corresponding internal combustion engine Download PDFInfo
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- US9228466B2 US9228466B2 US14/408,408 US201314408408A US9228466B2 US 9228466 B2 US9228466 B2 US 9228466B2 US 201314408408 A US201314408408 A US 201314408408A US 9228466 B2 US9228466 B2 US 9228466B2
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- charge air
- temperature
- metering valve
- internal combustion
- combustion engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2066—Selective catalytic reduction [SCR]
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- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/0807—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents
- F01N3/0814—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by using absorbents or adsorbents combined with catalytic converters, e.g. NOx absorption/storage reduction catalysts
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/18—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control
- F01N3/20—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust characterised by methods of operation; Control specially adapted for catalytic conversion ; Methods of operation or control of catalytic converters
- F01N3/2006—Periodically heating or cooling catalytic reactors, e.g. at cold starting or overheating
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- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B29/00—Engines characterised by provision for charging or scavenging not provided for in groups F02B25/00, F02B27/00 or F02B33/00 - F02B39/00; Details thereof
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- F02B29/0493—Controlling the air charge temperature
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
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- F02D41/0065—Specific aspects of external EGR control
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- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
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- F02M26/15—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system in relation to engine exhaust purifying apparatus
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- F01N11/00—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity
- F01N11/002—Monitoring or diagnostic devices for exhaust-gas treatment apparatus, e.g. for catalytic activity the diagnostic devices measuring or estimating temperature or pressure in, or downstream of the exhaust apparatus
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- F01N2240/00—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being
- F01N2240/02—Combination or association of two or more different exhaust treating devices, or of at least one such device with an auxiliary device, not covered by indexing codes F01N2230/00 or F01N2250/00, one of the devices being a heat exchanger
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- F01N2340/00—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses
- F01N2340/02—Dimensional characteristics of the exhaust system, e.g. length, diameter or volume of the apparatus; Spatial arrangements of exhaust apparatuses characterised by the distance of the apparatus to the engine, or the distance between two exhaust treating apparatuses
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- F01N2560/06—Exhaust systems with means for detecting or measuring exhaust gas components or characteristics the means being a temperature sensor
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- F01N2610/02—Adding substances to exhaust gases the substance being ammonia or urea
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- F01N2610/00—Adding substances to exhaust gases
- F01N2610/11—Adding substances to exhaust gases the substance or part of the dosing system being cooled
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- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
- F01N2900/06—Parameters used for exhaust control or diagnosing
- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
- F01N2900/1806—Properties of reducing agent or dosing system
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- F01N2900/00—Details of electrical control or of the monitoring of the exhaust gas treating apparatus
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- F01N2900/18—Parameters used for exhaust control or diagnosing said parameters being related to the system for adding a substance into the exhaust
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- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/08—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous
- F01N3/10—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for rendering innocuous by thermal or catalytic conversion of noxious components of exhaust
- F01N3/105—General auxiliary catalysts, e.g. upstream or downstream of the main catalyst
- F01N3/106—Auxiliary oxidation catalysts
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- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/0025—Controlling engines characterised by use of non-liquid fuels, pluralities of fuels, or non-fuel substances added to the combustible mixtures
- F02D41/0047—Controlling exhaust gas recirculation [EGR]
- F02D41/0077—Control of the EGR valve or actuator, e.g. duty cycle, closed loop control of position
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- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/02—EGR systems specially adapted for supercharged engines
- F02M26/04—EGR systems specially adapted for supercharged engines with a single turbocharger
- F02M26/06—Low pressure loops, i.e. wherein recirculated exhaust gas is taken out from the exhaust downstream of the turbocharger turbine and reintroduced into the intake system upstream of the compressor
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- F02M26/00—Engine-pertinent apparatus for adding exhaust gases to combustion-air, main fuel or fuel-air mixture, e.g. by exhaust gas recirculation [EGR] systems
- F02M26/13—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories
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- F02M26/16—Arrangement or layout of EGR passages, e.g. in relation to specific engine parts or for incorporation of accessories in relation to the exhaust system with EGR valves located at or near the connection to the exhaust system
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A50/00—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE in human health protection, e.g. against extreme weather
- Y02A50/20—Air quality improvement or preservation, e.g. vehicle emission control or emission reduction by using catalytic converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
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Definitions
- the present invention relates to a method for operating a metering valve for introducing a urea-water solution into the exhaust train of an internal combustion engine, and it also relates to a method for operating an internal combustion engine having a charge air cooler and a metering valve.
- the internal combustion engine can give rise to high temperatures on the internal combustion engine itself as well as on components of the internal combustion engine, for example, in the exhaust train of the internal combustion engine, and these temperatures can destroy or damage parts and components in the areas exposed to these temperatures.
- German patent application DE 10 2009 014 361 A1 relates, for example, to an exhaust-gas treatment unit for a vehicle with an SCR catalytic converter for reducing nitrogen oxides in the exhaust gas of an internal combustion engine.
- a turbocharger is installed upstream from the SCR catalytic converter.
- a metering unit serves to introduce a reductant into the exhaust gas at a feed site that is preferably arranged upstream from a turbine of the turbocharger.
- the metering unit can be actuated by means of a control unit, whereby it can also be provided that an aqueous urea solution is introduced into the exhaust gas system if very high exhaust-gas temperatures would otherwise lead to severe thermal stress to the turbine.
- the introduction of the aqueous urea solution can be provided as a measure to protect against temperatures at which exhaust gases cool off due to the application of evaporation heat.
- charge air coolers are used in order to ensure that air heated up by the supercharging is cooled off, as a result of which a higher charging density is made available to the combustion process in the cylinder.
- exhaust gases are introduced into the compressor together with the intake air.
- the compressed charge air is conveyed through the charge air cooler and it is finally fed to the combustion process after having been cooled off to a considerable extent.
- the water contained in the exhaust gas can condense in the charge air cooler and, if it accumulates, it can damage the charge air cooler and the internal combustion engine.
- German patent application DE 10 2009 006 966 A1 relates to a method for regulating the charge air cooler that is located in a coolant circuit of an internal combustion engine and that cools the charge air of the internal combustion engine.
- the cooling capacity of the charge air cooler is set by means of an adjustable circulation pump.
- German patent application DE 10 2008 035 747 A1 relates to an exhaust gas recirculation cooling system having several coolers. In order to avoid the formation of deposits on the cooler, so-called fouling (overcooling and condensation), the exhaust gas recirculation flow through and around several coolers is coordinated as a function of the operating conditions.
- German patent application DE 10 2007 038 242 A1 relates to a method for recirculating exhaust gas in order to feed the largest possible portion of exhaust gas that has been thoroughly mixed with fresh air back to an internal combustion engine at all of the operating points while reliably avoiding condensation effects.
- the portion of exhaust gas that is removed from the outlet line and fed back in upstream from a compressor in the inlet line is controlled and regulated as a function of the temperature in the inlet line.
- German patent application DE 10 2009 006 966 A1 relates to a method for regulating a charge air cooler with which the cooling capacity of the charge air cooler is set during the operation of the internal combustion engine as a function of two threshold values for the temperature of the charge air cooler.
- the cooling capacity of the charge air cooler can be set, for instance, by means of an adjustable circulation pump. In this manner, it is possible to lower the inertia of the cooling system.
- SCR SCR catalytic converter
- DPF diesel particulate filter
- the objective of the present invention is to protect the metering valve against excess temperatures.
- this objective is achieved by a method to operate a metering valve for introducing a urea-water solution into the exhaust train of an internal combustion engine, a method for operating an internal combustion engine, an internal combustion engine, and a vehicle.
- a method is being put forward for operating a metering valve for introducing a urea-water solution into the exhaust train of an internal combustion engine.
- the temperature of the metering valve is determined and a coolant is fed to the metering valve as a function of the temperature of the metering valve. Thanks to the cooling of the metering valve with the coolant, damage to or destruction of the metering valve due to excess temperatures can be prevented.
- the internal combustion engine also has a charge air cooler to which the coolant is fed in order to cool the charge air.
- the coolant is fed directly to the metering valve and to the charge air cooler by means of a shared adjustable coolant pump.
- a low-temperature water cooling circuit is normally used to cool the charge air cooler, and this water cooling circuit is generally at a lower temperature than a water cooling circuit for cooling the internal combustion engine. Since the metering valve is cooled with the same coolant as the charge air cooler, the metering valve can be kept at a much lower temperature than the cooling water temperature of the internal combustion engine. In this manner, wear and tear as well as damage to the metering valve can be reliably prevented. Since the metering valve and the charge air cooler are supplied with the same coolant by means of a shared coolant pump, no additional pumps or adjusting valves are needed, as a result of which the cooling of the metering valve can be achieved cost-effectively.
- the charge air that is cooled by the charge air comprises exhaust gases that are conveyed from the exhaust train to the charge air cooler at an adjustable exhaust gas recirculation rate.
- the temperature of the charge air is detected and the exhaust gas recirculation rate is set as a function of the temperature of the charge air and of the temperature of the metering valve.
- the shared coolant pump can prevent water from condensing in the charge air cooler, but then there is the risk that the metering valve will overheat.
- the charge air cooler is not charged with exhaust gas or with less exhaust gas from the exhaust gas recirculation system, it can be prevented that water will condense in the charge air cooler since, due to the lower exhaust gas recirculation rate, less exhaust gas containing water is fed into the charge air cooler, and at the same time, the cooling of the metering valve can be ensured. In other words, this ensures that the metering valve is constantly supplied with cooling water from the low-temperature water cooling circuit, but that the exhaust gas recirculation system, especially a low-pressure exhaust gas recirculation system, is adjusted under certain operating conditions in such a way that no impermissibly large volumes of water collect in the charge air cooler.
- a method for operating an internal combustion engine is also being put forward.
- the internal combustion engine has a metering valve as well as a charge air cooler for cooling charge air.
- the metering valve can be arranged in the exhaust train of the internal combustion engine for introducing a urea-water solution into the exhaust train.
- the metering valve can also be any other metering valve of the internal combustion engine that has to be protected against excess temperatures.
- the charge air comprises exhaust gases that are conveyed from the exhaust train of the internal combustion engine to the charge air cooler at an adjustable exhaust gas recirculation rate. With this method, the temperature of the metering valve is determined and the temperature of the charge air is detected.
- a coolant is fed to the metering valve and to the charge air cooler by means of a shared coolant pump as a function of the temperature of the metering valve.
- the exhaust gas recirculation rate is set as a function of the temperature of the charge air and of the temperature of the metering valve.
- the exhaust gas recirculation rate is reduced if the temperature of the charge air is less than a value that is dependent on the ambient temperature, and if the temperature of the metering valve is greater than a predetermined threshold value. If the temperature of the metering valve is greater than the predetermined threshold value, it becomes necessary to cool off the metering valve in order to prevent it from being damaged. For this reason, in this state, the coolant pump of the low-temperature cooling circuit cannot be slowed down. In order to avoid a condensation of water in the charge air cooler in this state, the exhaust gas recirculation rate can be reduced if the temperature of the charge air is less than the value that is dependent on the ambient temperature.
- the value that is dependent on the ambient temperature can be determined, for example, as a function of the ambient temperature by means of an electronic system of the internal combustion engine.
- the temperature of the charge air is detected downstream from the charge air cooler. In this manner, a possible condensation of water in the charge air cooler as well as a condensation of water in the intake train of the internal combustion engine between the charge air cooler and the internal combustion engine can be determined.
- the determination as to whether or not water from the charge air has condensed in the charge air cooler can be carried out, for example, on the basis of a model or on the basis of measured state variables of the charge air, or else by means of a suitable moisture sensor.
- the coolant is fed to the metering valve and to the charge air cooler by setting the pumping capacity of the coolant pump.
- the temperature of the metering valve can be set to the desired value and, at the same time, a suitable quantity of coolant can be fed to the charge air cooler.
- the pumping capacity of the coolant pump can be reduced, for example, in such a way that the metering valve is still cooled just barely sufficiently. In this manner, the condensation of water in the charge air cooler can be largely prevented. If there is nevertheless a risk of water condensation, then, as described above, the exhaust gas recirculation rate can be reduced.
- the pumping capacity of the coolant pump can be set correspondingly high. In this manner, sufficient coolant is fed to the charge air cooler and, at the same time, the metering valve is cooled.
- the metering valve is arranged at an outlet of an oxidation catalytic converter that is arranged between an exhaust manifold of the internal combustion engine and the metering valve.
- the temperature of the metering valve is determined at the outlet of the oxidation catalytic converter.
- a temperature sensor might already be necessary anyway in order to control the exhaust gas temperature as well as in conjunction with an SCR catalytic converter and a diesel particulate filter, so that the detection of the temperature of the metering valve can be achieved cost-effectively by means of this temperature sensor.
- the method described above can especially be used advantageously if the distance between the exhaust manifold and the oxidation catalytic converter is relatively small, especially if this distance is less than approximately 600 mm, since, in this case, the temperature stress to the metering valve is very high.
- an internal combustion engine is being put forward that comprises a metering valve for introducing a urea-water solution into the exhaust train of the internal combustion engine, a temperature sensor for detecting the temperature of the metering valve, a cooling circuit with a coolant pump and a control unit.
- the cooling circuit can especially be a so-called low-temperature cooling circuit that is provided, for instance, to cool a charge air cooler of the internal combustion engine.
- the cooling circuit is coupled to the metering valve in order to feed coolant to the metering valve.
- the control unit is coupled to the temperature sensor and to the coolant pump, and it is capable of determining the temperature of the metering valve and capable of feeding the coolant to the metering valve as a function of the temperature of the metering valve. In this manner, overheating of the metering valve in the exhaust train can be reliably prevented.
- an internal combustion engine is put forward that comprises a metering valve, a charge air cooler for cooling charge air, an exhaust gas recirculation system, a first temperature sensor for detecting the temperature of the metering valve, a second temperature sensor for detecting the temperature of the charge air, a cooling circuit with a coolant pump, and a control unit.
- the exhaust gas recirculation system is capable of feeding exhaust gases from the exhaust train of the internal combustion engine to the charge air at an adjustable exhaust gas recirculation rate.
- the cooling circuit is coupled to the metering valve and to the charge air cooler in order to feed coolant to the metering valve and to the charge air cooler.
- the cooling circuit is especially a so-called low-temperature cooling circuit whose coolant temperature is lower than the coolant temperature of the internal combustion engine that is used to cool the cylinders of the internal combustion engine.
- the control unit is coupled to the first temperature sensor, to the second temperature sensor, to the coolant pump and to a setting means that serves to set the exhaust gas recirculation rate.
- the setting means that serves to set the exhaust gas recirculation rate can comprise, for example, a control valve in the exhaust gas recirculation system.
- the control unit is configured to determine the temperature of the metering valve, to determine the temperature of the charge air, and to feed coolant to the metering valve and to the charge air cooler as a function of the temperature of the metering valve.
- the control unit is configured to set the exhaust gas recirculation rate as a function of the temperature of the charge air and of the temperature of the metering valve.
- FIG. 1 schematically shows an internal combustion engine according to an embodiment of the present invention.
- FIG. 2 shows the mode of operation of a method according to the invention for operating an internal combustion engine.
- FIG. 3 shows a vehicle according to an embodiment of the present invention.
- FIG. 1 shows an internal combustion engine 1 that comprises an engine block 2 with four cylinders 3 , a charge air cooler 4 , a low-temperature water cooler 5 , an adjustable water pump 6 , an oxidation catalytic converter 7 , an SCR metering valve 8 , and an SCR catalytic converter with a diesel particulate filter 9 .
- Additional components of the internal combustion engine 1 such as, for example, an exhaust gas turbocharger, a compressor and a cooling system for the cylinders 3 have been omitted from FIG. 1 for the sake of clarity.
- Intake air 9 is fed to the intake side 10 of the internal combustion engine 1 via the charge air cooler 4 .
- Exhaust gas can be fed into the intake air 9 via an exhaust gas recirculation system 11 .
- the exhaust gas recirculation system 11 is, for example, a low-pressure exhaust gas recirculation system that withdraws exhaust gases downstream from the SCR catalytic converter and/or from the diesel particulate filter 9 and feeds them into the intake air 9 .
- the exhaust gas recirculation system 11 comprises an exhaust gas recirculation valve 12 for setting an exhaust gas recirculation rate via the exhaust gas recirculation system 11 .
- the adjustable water pump 6 regulates the water flow in a low-temperature water cooling circuit leading from the low-temperature water cooler 5 to the charge air cooler 4 and the metering valve 8 .
- Exhaust gases from the cylinders 3 are conveyed through the oxidation catalytic converter 7 into the SCR catalytic converter and the diesel particulate filter 9 .
- an aqueous urea solution a so-called urea-water solution (HWL)
- HWL urea-water solution
- the metering valve 8 and the charge air cooler 4 are situated in the same low-temperature water coolant circuit and are thus always cooled at the same time.
- the charge air cooler 4 must not be cooled—in order to prevent condensation and water accumulation in the charge air cooler resulting from the fact that the exhaust gas that was recirculated on the low-pressure side is cooled to below the dew point.
- the exhaust gas recirculation rate via the exhaust gas recirculation system 11 is also set by means of the exhaust gas recirculation valve 12 , as will be explained below with reference to FIG. 2 .
- a control unit 13 detects the temperature downstream from the oxidation catalytic converter 7 by means of a first temperature sensor 14 and it detects the temperature of the charge air in the intake pipe 10 by means of a second temperature sensor 15 . If the temperature downstream from the oxidation catalytic converter exceeds a threshold value, that is to say, if the temperature of the metering valve is above a certain threshold value (Block 21 in FIG.
- a bit is set for a cooling demand of the metering valve (Block 24 ).
- the water pump 6 runs at least at a minimal pulse duty factor (Block 25 ).
- the bit for the cooling demand of the metering valve has been set (Block 24 ) and once the temperature in the intake pipe 10 is below a predetermined threshold value (Block 23 ), the low-pressure exhaust gas recirculation system is blocked or at least reduced (Block 26 ).
- the water pump is set accordingly.
- FIG. 3 shows a vehicle 30 with the internal combustion engine 1 .
- the distance between the exhaust manifold of the internal combustion engine 1 and the oxidation catalytic converter 7 can be relatively small.
- relatively high temperatures prevail at the outlet of the oxidation catalytic converter 7 so that the metering valve 8 has to be protected against these high temperatures in order to prevent temperature-related damage to the metering valve 8 .
- This distance is, for example, in the range from 40 cm to 60 cm.
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Exhaust Gas After Treatment (AREA)
- Exhaust-Gas Circulating Devices (AREA)
Abstract
Description
Claims (13)
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
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DE102012011991 | 2012-06-16 | ||
DE102012011991A DE102012011991A1 (en) | 2012-06-16 | 2012-06-16 | Method for operating a metering valve and for operating an internal combustion engine |
DE102012011991.7 | 2012-06-16 | ||
PCT/EP2013/058700 WO2013185973A1 (en) | 2012-06-16 | 2013-04-26 | Method for operating a dosing valve, and corresponding internal combustion engine |
Publications (2)
Publication Number | Publication Date |
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US20150226103A1 US20150226103A1 (en) | 2015-08-13 |
US9228466B2 true US9228466B2 (en) | 2016-01-05 |
Family
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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US14/408,408 Active US9228466B2 (en) | 2012-06-16 | 2013-04-26 | Method for operating a dosing valve, and corresponding internal combustion engine |
Country Status (4)
Country | Link |
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US (1) | US9228466B2 (en) |
EP (1) | EP2861841B1 (en) |
DE (1) | DE102012011991A1 (en) |
WO (1) | WO2013185973A1 (en) |
Cited By (1)
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US20160040587A1 (en) * | 2014-08-07 | 2016-02-11 | Caterpillar Inc. | Cooling system having pulsed fan control |
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DE102014003580A1 (en) * | 2014-03-11 | 2015-09-17 | Daimler Ag | Cooling arrangement and method for cooling a metering device |
JP6364895B2 (en) | 2014-04-02 | 2018-08-01 | 株式会社デンソー | EGR system for internal combustion engine |
DE202014005513U1 (en) * | 2014-07-05 | 2015-10-06 | GM Global Technology Operations LLC (n. d. Ges. d. Staates Delaware) | Cooling system for an internal combustion engine |
DE102016205105A1 (en) * | 2016-03-29 | 2017-10-05 | Robert Bosch Gmbh | A method for operating a metering system for the reducing agent solution of an SCR catalyst device in the exhaust line of an internal combustion engine |
JP6323488B2 (en) * | 2016-03-31 | 2018-05-16 | トヨタ自動車株式会社 | Control device for internal combustion engine |
US10066528B2 (en) * | 2016-06-10 | 2018-09-04 | Robert Bosch Gmbh | DNOx dosing tester and method |
JP6536708B2 (en) * | 2018-03-08 | 2019-07-03 | 株式会社デンソー | EGR system for internal combustion engine |
DE102020101074A1 (en) | 2020-01-17 | 2021-07-22 | Volkswagen Aktiengesellschaft | Cooling system for a reducing agent metering system and an internal combustion engine with such a cooling system |
DE102021107434A1 (en) | 2021-03-24 | 2022-09-29 | Volkswagen Aktiengesellschaft | Cooling system for a reducing agent dosing system and internal combustion engine with such a cooling system |
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Also Published As
Publication number | Publication date |
---|---|
WO2013185973A1 (en) | 2013-12-19 |
DE102012011991A1 (en) | 2013-12-19 |
EP2861841B1 (en) | 2016-10-12 |
US20150226103A1 (en) | 2015-08-13 |
EP2861841A1 (en) | 2015-04-22 |
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